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1 (The nose and mouth make up the first part where air enters your body. 2  The trachea, or windpipe, is the second part and it delivers air to the lungs. 3  Your lungs are the third part where oxygen is absorbed by the blood, which brings it to the rest of the body. 4  Finally, the diaphragm is the fourth part.
Air rushes into the lungs to make the pressure equal â a breath in. The size of your lungs varies according to what you are doing. The body has a special set of muscles that help to make the lungs increase in size. The most important muscle of inhalation is the diaphragm.